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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08734a51dc55810152c185769ae540f132451c00584fd1b5c7f644d4546e251c' 
  AND token = 'ldx2QbCgG4YZEze693Ji42L1t4wOc1MRaGzLSd7MP3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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