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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3b43d693e044cb659b5b99da677fc1b3f0df912b01622e787b2f4b80d65ec2' 
  AND token = 'Psl8DAIxU42+dV57I05Lc11NTSqY7H+twUOmAI4eRYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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