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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4eaf62009792cdaef36abf62c97ec0dfcd479a0afa93f0f49c4d4ecd49ee82' 
  AND token = '+Hu31UK418LLH7YmSJkzjxCLdq9SBNcYHvjJzveS174=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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