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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad6d8430f20f5fa16ccee9a763675c553aa4294c1bcd4a6a6f422e3cbb894b0' 
  AND token = 'TohBBESSkco+GGcVwWe3EE0rli4rWl0PZXowq6sZCJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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