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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7743891a80c49c83310f70c5806dc9a27d10f89336735c015ff5856d6e63f06e' 
  AND token = 'rSv2VbvDQzWSkh4NEXm5lU8u1L+0bOEQLHPxtYG5l8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}