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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de92d6d44c18dd29f14576515caa1ec5aeacccbc85d028c865f2461eba528e3' 
  AND token = 'Wxmm0WVBc0SWIsHeptAJDS6cuiwtwVU1j89kB+K5S1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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