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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980780e1970472388653a3410d815ad932737c458b80f143c8fd2a8ad5d122c6' 
  AND token = '44TvOZOSFxwpM7HnR/uT1g7Rz03OGLrMU06RVBrfLGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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