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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '375b9460341abc28d436da900e4989b96103fd5ce0fef54b5b9ca6ac45ccc8a1' 
  AND token = 'kTM4iq5rOsKD2RufLgmfyu5GlFH/E/8dS8K9fopp/HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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