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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce4e91c37d4561397b32616c7b8040cc312be2d348c96b1c7434615e4af2574' 
  AND token = 'ZsrILAugDDqpbECnzFDnUnz9Q8/NoZWwf7Y4gifHESQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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