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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad6846f6522e2e9a71eb73387f4f59d3a60c96ad9e7e9d615be1238401f5d44' 
  AND token = 'yueB/SPbjfY1Qb8wdx9fQo4TIKx0+8BC2gZFDN8vPR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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