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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c8df340a966c24b677c24ca554a8462a19d0579f7d3aeed66ec2c70b195f0c' 
  AND token = 'Yjjf+hty+jd4HL2fSCGXrInnA/poyY/aWe55YnWJdwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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