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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ff88fc2bab670ff79528072a77df0198363298102bd3c89a0d6690c469af79' 
  AND token = 'SaruPP5iADN7KspklU1OmTrM9cGMU40Yr+2ppB+1t30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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